/**
 * $Revision$
 * $Date$
 *
 * Copyright 2003-2007 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smackx.workgroup.agent;

import org.jivesoftware.smackx.workgroup.packet.AgentInfo;
import org.jivesoftware.smackx.workgroup.packet.AgentWorkgroups;
import org.jivesoftware.smack.PacketCollector;
import org.jivesoftware.smack.SmackConfiguration;
import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.filter.PacketIDFilter;
import org.jivesoftware.smack.packet.IQ;

import java.util.Collection;

/**
 * The <code>Agent</code> class is used to represent one agent in a Workgroup
 * Queue.
 * 
 * @author Derek DeMoro
 */
public class Agent {
	private Connection connection;
	private String workgroupJID;

	public static Collection<String> getWorkgroups(String serviceJID,
			String agentJID, Connection connection) throws XMPPException {
		AgentWorkgroups request = new AgentWorkgroups(agentJID);
		request.setTo(serviceJID);
		PacketCollector collector = connection
				.createPacketCollector(new PacketIDFilter(request.getPacketID()));
		// Send the request
		connection.sendPacket(request);

		AgentWorkgroups response = (AgentWorkgroups) collector
				.nextResult(SmackConfiguration.getPacketReplyTimeout());

		// Cancel the collector.
		collector.cancel();
		if (response == null) {
			throw new XMPPException("No response from server on status set.");
		}
		if (response.getError() != null) {
			throw new XMPPException(response.getError());
		}
		return response.getWorkgroups();
	}

	/**
	 * Constructs an Agent.
	 */
	Agent(Connection connection, String workgroupJID) {
		this.connection = connection;
		this.workgroupJID = workgroupJID;
	}

	/**
	 * Return the agents JID
	 * 
	 * @return - the agents JID.
	 */
	public String getUser() {
		return connection.getUser();
	}

	/**
	 * Return the agents name.
	 * 
	 * @return - the agents name.
	 */
	public String getName() throws XMPPException {
		AgentInfo agentInfo = new AgentInfo();
		agentInfo.setType(IQ.Type.GET);
		agentInfo.setTo(workgroupJID);
		agentInfo.setFrom(getUser());
		PacketCollector collector = connection
				.createPacketCollector(new PacketIDFilter(agentInfo
						.getPacketID()));
		// Send the request
		connection.sendPacket(agentInfo);

		AgentInfo response = (AgentInfo) collector
				.nextResult(SmackConfiguration.getPacketReplyTimeout());

		// Cancel the collector.
		collector.cancel();
		if (response == null) {
			throw new XMPPException("No response from server on status set.");
		}
		if (response.getError() != null) {
			throw new XMPPException(response.getError());
		}
		return response.getName();
	}

	/**
	 * Changes the name of the agent in the server. The server may have this
	 * functionality disabled for all the agents or for this agent in
	 * particular. If the agent is not allowed to change his name then an
	 * exception will be thrown with a service_unavailable error code.
	 * 
	 * @param newName
	 *            the new name of the agent.
	 * @throws XMPPException
	 *             if the agent is not allowed to change his name or no response
	 *             was obtained from the server.
	 */
	public void setName(String newName) throws XMPPException {
		AgentInfo agentInfo = new AgentInfo();
		agentInfo.setType(IQ.Type.SET);
		agentInfo.setTo(workgroupJID);
		agentInfo.setFrom(getUser());
		agentInfo.setName(newName);
		PacketCollector collector = connection
				.createPacketCollector(new PacketIDFilter(agentInfo
						.getPacketID()));
		// Send the request
		connection.sendPacket(agentInfo);

		IQ response = (IQ) collector.nextResult(SmackConfiguration
				.getPacketReplyTimeout());

		// Cancel the collector.
		collector.cancel();
		if (response == null) {
			throw new XMPPException("No response from server on status set.");
		}
		if (response.getError() != null) {
			throw new XMPPException(response.getError());
		}
		return;
	}
}
